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Finding the Third Proportional to 311.63 and 684.42

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Solution

The third proportional to 311.63 and 684.42 is: 1,503.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.63 : 684.42 = 684.42 : x
  2. Step 2: Convert to fraction form
    311.63/684.42 = 684.42/x
  3. Step 3: Cross multiply
    311.63x = 684.42 × 684.42
  4. Step 4: Simplify right side
    311.63x = 468,433.30
  5. Step 5: Solve for x
    x = 468,433.30/311.63
  6. Step 6: Final answer
    x = 1,503.20

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.